To Next Page

To Previous Page

Table 5-14. Mechanical Buttons

SAM E54 pin Silkscreen text Shared functionality

RESET RESET Cortex DBG , TRACE, and EDBG SWD

PB31 SW0 EDBG GPIO3

5.3.3 LED

There is one yellow LED available on the SAM E54 Xplained Pro board that can be turned ON and OFF.

The LED can be activated by driving the connected I/O line to GND.

Table 5-15. LED Connection

SAM E54 pin Function Shared functionality

PC18 Yellow LED0 PDEC and EDBG GPIO2

5.3.4 QTouch Button

There is one self capacitance button available on the SAM E54 Xplained Pro board that can be used as

user button. This QTouch button is intended to be driven by the built-in Peripheral Touch Controller (PTC)

of the device.

Info: To get started with QTouch, refer to QTouch

Library, or find examples in Atmel START.

Table 5-16. QTouch Connection

SAM E54 pin Silkscreen text Shared functionality

PA16 QT BUTTON PCC

5.3.5 Backup Super Capacitor

SAM E54 Xplained Pro has a 47 mF backup super capacitor for use with the SAM E54 backup system.

The super capacitor can be connected to the device as described in VBAT Backup Select.

Due to the high capacitive load represented by the super capacitor, a 220Ω limiting resistor is added to

reduce inrush current. The source for charging is the targets main supply and a low-power opamp is used

for disconnecting the charger input when removing power. This is added to avoid a current leak back to

the main supply from the super capacitor when power is removed.

A full charge of the super capacitor from an empty state will take approximately 45 seconds and can

supply the target device in backup mode with ULP running for up to ~20 hours. Other modes are not

characterized, but will reduce the available time in backup mode respectively. For more information about

the current consumption in other modes, refer to the electrical characteristics chapter in the SAM E54

datasheet.

Caution: Due to an issue with the VBAT pin in the A0 revision of ATSAME54P20A there is an

over-consumption of current in the VBAT pin when VBAT > VDDIO. This issue renders the on-

board super capacitor backup solution not usable.

Microchip Technology SAM E54 Xplained Pro User Manual

Questions and Answers: